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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Reconciliation between Basic and Diluted Weighted Average Shares Outstanding | The following is a reconciliation between basic and diluted weighted average shares outstanding for the years ended December 31:
(in thousands, except per share data) |  | 2012 |  |  | 2011 |  |  | 2010 |
Net income |  | $ | 184,045 |  |  | $ | 163,995 |  |  | $ | 161,752 |
Net income attributable to unvested awarded performance stock |  |  | (5,313 | ) |  |  | (5,099 | ) |  |  | (5,097 | )
Net income attributable to common shares |  | $ | 178,732 |  |  | $ | 158,896 |  |  | $ | 156,655 |
Weighted average basic number of common shares outstanding |  |  | 143,507 |  |  |  | 143,029 |  |  |  | 142,412 |
Less unvested awarded performance stock included in weighted average basic share outstanding |  |  | (4,143 | ) |  |  | (4,447 | ) |  |  | (4,488 | )
Weighted average number of common shares outstanding for basic earnings per common share |  |  | 139,364 |  |  |  | 138,582 |  |  |  | 137,924 |
Dilutive effect of stock options |  |  | 2,646 |  |  |  | 1,682 |  |  |  | 1,394 |
Weighted average number of shares outstanding |  |  | 142,010 |  |  |  | 140,264 |  |  |  | 139,318 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.28 |  |  | $ | 1.15 |  |  | $ | 1.14 |
Diluted |  | $ | 1.26 |  |  | $ | 1.13 |  |  | $ | 1.12 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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